If you have or know kids, the name LEGO must sound familiar. Kjeld Kirk Kristiansen is best known to be the CEO and President of LEGO, the most successful toy company based in Denmark. Today, at the age of 67, Kjeld has the net worth of US $ 9.5 billion, but his story of success is an unbelievable mix of ups and downs, success and failures, trials, inventions and experiments.